It turns out that Kennedy's grandfather, John "Honey Fitz" Fitzgerald, the mayor of Boston, threw out the very first pitch at Fenway Park in 1912. The Kennedy grandad was a member of the Royal Rooters.
Today, the Royal Rooters of Red Sox Nation even have a blog.
So, it seems that Royal Caribbean's Royal Champions, which made for unflattering headlines about user-generated content a few weeks ago, weren't the first "Royal" rooting section.
No word, though, on whether the Boston Red Sox in the early 1900s encouraged the Royal Rooters to post puffy reviews on CruiseCritic.com:)